Of the number of aquatic weeds that are found in your pond there are many that can cause more issues that others. One of these plants is Hydrilla. Released in the United States in Floridawaterways in the 1960’s, hydrilla has now established in many states. The eradication of this invasive weed is costing millions of dollars each year. This aquatic weed spreads very quickly, clogging waterways, wrapping around boat propellers, and even getting tangled around the legs of unsuspecting swimmers, resulting in drowning. It is a submersed plant that can grow to the surface and form dense mats. It may be found in all types of water bodies from stagnant ponds to flowing mountain streams.
Hydrilla stems are slender, branched and up to 25 feet long. Hydrilla's small leaves are strap-like and pointed.They grow in whorls of four to eight around the stem.The leafmargins are distinctly saw-toothed. Hydrilla often has one or more sharp teeth along the length of the leaf mid-rib. Hydrilla produces tiny white flowers on long stalks. It also produces 1/4 inch turions at the leaf axils and potato-like tubers attached to the roots in the mud. The tubers can lay dormant for several years making control of these plants difficult.